2 * sha2-ce-glue.c - SHA-224/SHA-256 using ARMv8 Crypto Extensions
4 * Copyright (C) 2014 Linaro Ltd <ard.biesheuvel@linaro.org>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
12 #include <asm/unaligned.h>
13 #include <crypto/internal/hash.h>
14 #include <crypto/sha.h>
15 #include <linux/cpufeature.h>
16 #include <linux/crypto.h>
17 #include <linux/module.h>
19 MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions");
20 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
21 MODULE_LICENSE("GPL v2");
23 asmlinkage int sha2_ce_transform(int blocks, u8 const *src, u32 *state,
24 u8 *head, long bytes);
26 static int sha224_init(struct shash_desc *desc)
28 struct sha256_state *sctx = shash_desc_ctx(desc);
30 *sctx = (struct sha256_state){
32 SHA224_H0, SHA224_H1, SHA224_H2, SHA224_H3,
33 SHA224_H4, SHA224_H5, SHA224_H6, SHA224_H7,
39 static int sha256_init(struct shash_desc *desc)
41 struct sha256_state *sctx = shash_desc_ctx(desc);
43 *sctx = (struct sha256_state){
45 SHA256_H0, SHA256_H1, SHA256_H2, SHA256_H3,
46 SHA256_H4, SHA256_H5, SHA256_H6, SHA256_H7,
52 static int sha2_update(struct shash_desc *desc, const u8 *data,
55 struct sha256_state *sctx = shash_desc_ctx(desc);
56 unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;
60 if ((partial + len) >= SHA256_BLOCK_SIZE) {
64 int p = SHA256_BLOCK_SIZE - partial;
66 memcpy(sctx->buf + partial, data, p);
71 blocks = len / SHA256_BLOCK_SIZE;
72 len %= SHA256_BLOCK_SIZE;
74 kernel_neon_begin_partial(28);
75 sha2_ce_transform(blocks, data, sctx->state,
76 partial ? sctx->buf : NULL, 0);
79 data += blocks * SHA256_BLOCK_SIZE;
83 memcpy(sctx->buf + partial, data, len);
87 static void sha2_final(struct shash_desc *desc)
89 static const u8 padding[SHA256_BLOCK_SIZE] = { 0x80, };
91 struct sha256_state *sctx = shash_desc_ctx(desc);
92 __be64 bits = cpu_to_be64(sctx->count << 3);
93 u32 padlen = SHA256_BLOCK_SIZE
94 - ((sctx->count + sizeof(bits)) % SHA256_BLOCK_SIZE);
96 sha2_update(desc, padding, padlen);
97 sha2_update(desc, (const u8 *)&bits, sizeof(bits));
100 static int sha224_final(struct shash_desc *desc, u8 *out)
102 struct sha256_state *sctx = shash_desc_ctx(desc);
103 __be32 *dst = (__be32 *)out;
108 for (i = 0; i < SHA224_DIGEST_SIZE / sizeof(__be32); i++)
109 put_unaligned_be32(sctx->state[i], dst++);
111 *sctx = (struct sha256_state){};
115 static int sha256_final(struct shash_desc *desc, u8 *out)
117 struct sha256_state *sctx = shash_desc_ctx(desc);
118 __be32 *dst = (__be32 *)out;
123 for (i = 0; i < SHA256_DIGEST_SIZE / sizeof(__be32); i++)
124 put_unaligned_be32(sctx->state[i], dst++);
126 *sctx = (struct sha256_state){};
130 static void sha2_finup(struct shash_desc *desc, const u8 *data,
133 struct sha256_state *sctx = shash_desc_ctx(desc);
136 if (sctx->count || !len || (len % SHA256_BLOCK_SIZE)) {
137 sha2_update(desc, data, len);
143 * Use a fast path if the input is a multiple of 64 bytes. In
144 * this case, there is no need to copy data around, and we can
145 * perform the entire digest calculation in a single invocation
146 * of sha2_ce_transform()
148 blocks = len / SHA256_BLOCK_SIZE;
150 kernel_neon_begin_partial(28);
151 sha2_ce_transform(blocks, data, sctx->state, NULL, len);
155 static int sha224_finup(struct shash_desc *desc, const u8 *data,
156 unsigned int len, u8 *out)
158 struct sha256_state *sctx = shash_desc_ctx(desc);
159 __be32 *dst = (__be32 *)out;
162 sha2_finup(desc, data, len);
164 for (i = 0; i < SHA224_DIGEST_SIZE / sizeof(__be32); i++)
165 put_unaligned_be32(sctx->state[i], dst++);
167 *sctx = (struct sha256_state){};
171 static int sha256_finup(struct shash_desc *desc, const u8 *data,
172 unsigned int len, u8 *out)
174 struct sha256_state *sctx = shash_desc_ctx(desc);
175 __be32 *dst = (__be32 *)out;
178 sha2_finup(desc, data, len);
180 for (i = 0; i < SHA256_DIGEST_SIZE / sizeof(__be32); i++)
181 put_unaligned_be32(sctx->state[i], dst++);
183 *sctx = (struct sha256_state){};
187 static int sha2_export(struct shash_desc *desc, void *out)
189 struct sha256_state *sctx = shash_desc_ctx(desc);
190 struct sha256_state *dst = out;
196 static int sha2_import(struct shash_desc *desc, const void *in)
198 struct sha256_state *sctx = shash_desc_ctx(desc);
199 struct sha256_state const *src = in;
205 static struct shash_alg algs[] = { {
207 .update = sha2_update,
208 .final = sha224_final,
209 .finup = sha224_finup,
210 .export = sha2_export,
211 .import = sha2_import,
212 .descsize = sizeof(struct sha256_state),
213 .digestsize = SHA224_DIGEST_SIZE,
214 .statesize = sizeof(struct sha256_state),
216 .cra_name = "sha224",
217 .cra_driver_name = "sha224-ce",
219 .cra_flags = CRYPTO_ALG_TYPE_SHASH,
220 .cra_blocksize = SHA256_BLOCK_SIZE,
221 .cra_module = THIS_MODULE,
225 .update = sha2_update,
226 .final = sha256_final,
227 .finup = sha256_finup,
228 .export = sha2_export,
229 .import = sha2_import,
230 .descsize = sizeof(struct sha256_state),
231 .digestsize = SHA256_DIGEST_SIZE,
232 .statesize = sizeof(struct sha256_state),
234 .cra_name = "sha256",
235 .cra_driver_name = "sha256-ce",
237 .cra_flags = CRYPTO_ALG_TYPE_SHASH,
238 .cra_blocksize = SHA256_BLOCK_SIZE,
239 .cra_module = THIS_MODULE,
243 static int __init sha2_ce_mod_init(void)
245 return crypto_register_shashes(algs, ARRAY_SIZE(algs));
248 static void __exit sha2_ce_mod_fini(void)
250 crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
253 module_cpu_feature_match(SHA2, sha2_ce_mod_init);
254 module_exit(sha2_ce_mod_fini);